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jfs: logmgr: use __bio_add_page to add single page to bio
[linux-block.git] / io_uring / net.c
CommitLineData
f9ead18c
JA		 1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/errno.h>
4#include <linux/file.h>
5#include <linux/slab.h>
6#include <linux/net.h>
7#include <linux/compat.h>
8#include <net/compat.h>
9#include <linux/io_uring.h>
10
11#include <uapi/linux/io_uring.h>
12
f9ead18c 13#include "io_uring.h"
3b77495a 14#include "kbuf.h"
43e0bbbd 15#include "alloc_cache.h"
f9ead18c 16#include "net.h"
06a5464b 17#include "notif.h"
10c7d33e 18#include "rsrc.h"
f9ead18c
JA		 19
20#if defined(CONFIG_NET)
21struct io_shutdown {
22 struct file *file;
23 int how;
24};
25
26struct io_accept {
27 struct file *file;
28 struct sockaddr __user *addr;
29 int __user *addr_len;
30 int flags;
31 u32 file_slot;
32 unsigned long nofile;
33};
34
35struct io_socket {
36 struct file *file;
37 int domain;
38 int type;
39 int protocol;
40 int flags;
41 u32 file_slot;
42 unsigned long nofile;
43};
44
45struct io_connect {
46 struct file *file;
47 struct sockaddr __user *addr;
48 int addr_len;
3fb1bd68 49 bool in_progress;
74e2e17e 50 bool seen_econnaborted;
f9ead18c
JA		 51};
52
53struct io_sr_msg {
54 struct file *file;
55 union {
56 struct compat_msghdr __user *umsg_compat;
57 struct user_msghdr __user *umsg;
58 void __user *buf;
59 };
0b048557
PB		 60 unsigned len;
61 unsigned done_io;
293402e5 62 unsigned msg_flags;
0b048557 63 u16 flags;
516e82f0 64 /* initialised and used only by !msg send variants */
0b048557 65 u16 addr_len;
b00c51ef 66 u16 buf_group;
092aeedb 67 void __user *addr;
516e82f0 68 /* used only for send zerocopy */
b48c312b 69 struct io_kiocb *notif;
06a5464b
PB		 70};
71
17add5ce
PB		 72static inline bool io_check_multishot(struct io_kiocb *req,
73 unsigned int issue_flags)
74{
75 /*
76 * When ->locked_cq is set we only allow to post CQEs from the original
77 * task context. Usual request completions will be handled in other
78 * generic paths but multipoll may decide to post extra cqes.
79 */
80 return !(issue_flags & IO_URING_F_IOWQ) ||
81 !(issue_flags & IO_URING_F_MULTISHOT) ||
82 !req->ctx->task_complete;
83}
84
f9ead18c
JA		 85int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
86{
f2ccb5ae 87 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
f9ead18c
JA		 88
89 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags ||
90 sqe->buf_index || sqe->splice_fd_in))
91 return -EINVAL;
92
93 shutdown->how = READ_ONCE(sqe->len);
aebb224f 94 req->flags |= REQ_F_FORCE_ASYNC;
f9ead18c
JA		 95 return 0;
96}
97
98int io_shutdown(struct io_kiocb *req, unsigned int issue_flags)
99{
f2ccb5ae 100 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
f9ead18c
JA		 101 struct socket *sock;
102 int ret;
103
aebb224f 104 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
f9ead18c
JA		 105
106 sock = sock_from_file(req->file);
107 if (unlikely(!sock))
108 return -ENOTSOCK;
109
110 ret = __sys_shutdown_sock(sock, shutdown->how);
111 io_req_set_res(req, ret, 0);
112 return IOU_OK;
113}
114
115static bool io_net_retry(struct socket *sock, int flags)
116{
117 if (!(flags & MSG_WAITALL))
118 return false;
119 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
120}
121
43e0bbbd
JA		 122static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
123{
124 struct io_async_msghdr *hdr = req->async_data;
125
06360426 126 if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED)
43e0bbbd
JA		 127 return;
128
129 /* Let normal cleanup path reap it if we fail adding to the cache */
130 if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) {
131 req->async_data = NULL;
132 req->flags &= ~REQ_F_ASYNC_DATA;
133 }
134}
135
858c293e
PB		 136static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req,
137 unsigned int issue_flags)
43e0bbbd
JA		 138{
139 struct io_ring_ctx *ctx = req->ctx;
140 struct io_cache_entry *entry;
4c17a496 141 struct io_async_msghdr *hdr;
43e0bbbd 142
df730ec2
XL		 143 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
144 entry = io_alloc_cache_get(&ctx->netmsg_cache);
145 if (entry) {
146 hdr = container_of(entry, struct io_async_msghdr, cache);
147 hdr->free_iov = NULL;
148 req->flags |= REQ_F_ASYNC_DATA;
149 req->async_data = hdr;
150 return hdr;
151 }
43e0bbbd
JA		 152 }
153
4c17a496
PB		 154 if (!io_alloc_async_data(req)) {
155 hdr = req->async_data;
156 hdr->free_iov = NULL;
157 return hdr;
158 }
43e0bbbd
JA		 159 return NULL;
160}
161
858c293e
PB		 162static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req)
163{
164 /* ->prep_async is always called from the submission context */
165 return io_msg_alloc_async(req, 0);
166}
167
f9ead18c 168static int io_setup_async_msg(struct io_kiocb *req,
43e0bbbd
JA		 169 struct io_async_msghdr *kmsg,
170 unsigned int issue_flags)
f9ead18c 171{
3f743e9b 172 struct io_async_msghdr *async_msg;
f9ead18c 173
3f743e9b 174 if (req_has_async_data(req))
f9ead18c 175 return -EAGAIN;
858c293e 176 async_msg = io_msg_alloc_async(req, issue_flags);
43e0bbbd 177 if (!async_msg) {
f9ead18c
JA		 178 kfree(kmsg->free_iov);
179 return -ENOMEM;
180 }
f9ead18c
JA		 181 req->flags |= REQ_F_NEED_CLEANUP;
182 memcpy(async_msg, kmsg, sizeof(*kmsg));
6f10ae8a
PB		 183 if (async_msg->msg.msg_name)
184 async_msg->msg.msg_name = &async_msg->addr;
f9ead18c 185 /* if were using fast_iov, set it to the new one */
4b61152e 186 if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) {
de4f5fed
JA		 187 size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov;
188 async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx];
3e4cb6eb 189 }
f9ead18c
JA		 190
191 return -EAGAIN;
192}
193
194static int io_sendmsg_copy_hdr(struct io_kiocb *req,
195 struct io_async_msghdr *iomsg)
196{
f2ccb5ae 197 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 198
199 iomsg->msg.msg_name = &iomsg->addr;
200 iomsg->free_iov = iomsg->fast_iov;
201 return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags,
202 &iomsg->free_iov);
203}
204
516e82f0 205int io_send_prep_async(struct io_kiocb *req)
581711c4 206{
ac9e5784 207 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
581711c4
PB		 208 struct io_async_msghdr *io;
209 int ret;
210
211 if (!zc->addr || req_has_async_data(req))
212 return 0;
6bf8ad25
PB		 213 io = io_msg_alloc_async_prep(req);
214 if (!io)
581711c4 215 return -ENOMEM;
581711c4
PB		 216 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr);
217 return ret;
218}
219
220static int io_setup_async_addr(struct io_kiocb *req,
6ae61b7a 221 struct sockaddr_storage *addr_storage,
581711c4
PB		 222 unsigned int issue_flags)
223{
6ae61b7a 224 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
581711c4
PB		 225 struct io_async_msghdr *io;
226
6ae61b7a 227 if (!sr->addr || req_has_async_data(req))
581711c4 228 return -EAGAIN;
6bf8ad25
PB		 229 io = io_msg_alloc_async(req, issue_flags);
230 if (!io)
581711c4 231 return -ENOMEM;
6ae61b7a 232 memcpy(&io->addr, addr_storage, sizeof(io->addr));
581711c4
PB		 233 return -EAGAIN;
234}
235
f9ead18c
JA		 236int io_sendmsg_prep_async(struct io_kiocb *req)
237{
238 int ret;
239
858c293e
PB		 240 if (!io_msg_alloc_async_prep(req))
241 return -ENOMEM;
f9ead18c
JA		 242 ret = io_sendmsg_copy_hdr(req, req->async_data);
243 if (!ret)
244 req->flags |= REQ_F_NEED_CLEANUP;
245 return ret;
246}
247
248void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req)
249{
250 struct io_async_msghdr *io = req->async_data;
251
252 kfree(io->free_iov);
253}
254
255int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
256{
f2ccb5ae 257 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c 258
516e82f0
PB		 259 if (req->opcode == IORING_OP_SEND) {
260 if (READ_ONCE(sqe->__pad3[0]))
261 return -EINVAL;
262 sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
263 sr->addr_len = READ_ONCE(sqe->addr_len);
264 } else if (sqe->addr2 || sqe->file_index) {
f9ead18c 265 return -EINVAL;
516e82f0 266 }
f9ead18c
JA		 267
268 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
269 sr->len = READ_ONCE(sqe->len);
270 sr->flags = READ_ONCE(sqe->ioprio);
271 if (sr->flags & ~IORING_RECVSEND_POLL_FIRST)
272 return -EINVAL;
273 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
274 if (sr->msg_flags & MSG_DONTWAIT)
275 req->flags |= REQ_F_NOWAIT;
276
277#ifdef CONFIG_COMPAT
278 if (req->ctx->compat)
279 sr->msg_flags |= MSG_CMSG_COMPAT;
280#endif
281 sr->done_io = 0;
282 return 0;
283}
284
285int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
286{
f2ccb5ae 287 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 288 struct io_async_msghdr iomsg, *kmsg;
289 struct socket *sock;
290 unsigned flags;
291 int min_ret = 0;
292 int ret;
293
294 sock = sock_from_file(req->file);
295 if (unlikely(!sock))
296 return -ENOTSOCK;
297
298 if (req_has_async_data(req)) {
299 kmsg = req->async_data;
300 } else {
301 ret = io_sendmsg_copy_hdr(req, &iomsg);
302 if (ret)
303 return ret;
304 kmsg = &iomsg;
305 }
306
307 if (!(req->flags & REQ_F_POLLED) &&
308 (sr->flags & IORING_RECVSEND_POLL_FIRST))
43e0bbbd 309 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c
JA		 310
311 flags = sr->msg_flags;
312 if (issue_flags & IO_URING_F_NONBLOCK)
313 flags |= MSG_DONTWAIT;
314 if (flags & MSG_WAITALL)
315 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
316
317 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
318
319 if (ret < min_ret) {
320 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
43e0bbbd 321 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c
JA		 322 if (ret > 0 && io_net_retry(sock, flags)) {
323 sr->done_io += ret;
324 req->flags |= REQ_F_PARTIAL_IO;
43e0bbbd 325 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c 326 }
95eafc74
PB		 327 if (ret == -ERESTARTSYS)
328 ret = -EINTR;
f9ead18c
JA		 329 req_set_fail(req);
330 }
331 /* fast path, check for non-NULL to avoid function call */
332 if (kmsg->free_iov)
333 kfree(kmsg->free_iov);
334 req->flags &= ~REQ_F_NEED_CLEANUP;
43e0bbbd 335 io_netmsg_recycle(req, issue_flags);
f9ead18c
JA		 336 if (ret >= 0)
337 ret += sr->done_io;
338 else if (sr->done_io)
339 ret = sr->done_io;
340 io_req_set_res(req, ret, 0);
341 return IOU_OK;
342}
343
344int io_send(struct io_kiocb *req, unsigned int issue_flags)
345{
516e82f0 346 struct sockaddr_storage __address;
f2ccb5ae 347 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c 348 struct msghdr msg;
f9ead18c
JA		 349 struct socket *sock;
350 unsigned flags;
351 int min_ret = 0;
352 int ret;
353
04360d3e
PB		 354 msg.msg_name = NULL;
355 msg.msg_control = NULL;
356 msg.msg_controllen = 0;
357 msg.msg_namelen = 0;
358 msg.msg_ubuf = NULL;
359
516e82f0
PB		 360 if (sr->addr) {
361 if (req_has_async_data(req)) {
362 struct io_async_msghdr *io = req->async_data;
363
364 msg.msg_name = &io->addr;
365 } else {
366 ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address);
367 if (unlikely(ret < 0))
368 return ret;
369 msg.msg_name = (struct sockaddr *)&__address;
370 }
371 msg.msg_namelen = sr->addr_len;
372 }
373
f9ead18c
JA		 374 if (!(req->flags & REQ_F_POLLED) &&
375 (sr->flags & IORING_RECVSEND_POLL_FIRST))
516e82f0 376 return io_setup_async_addr(req, &__address, issue_flags);
f9ead18c
JA		 377
378 sock = sock_from_file(req->file);
379 if (unlikely(!sock))
380 return -ENOTSOCK;
381
4b61152e 382 ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter);
f9ead18c
JA		 383 if (unlikely(ret))
384 return ret;
385
f9ead18c
JA		 386 flags = sr->msg_flags;
387 if (issue_flags & IO_URING_F_NONBLOCK)
388 flags |= MSG_DONTWAIT;
389 if (flags & MSG_WAITALL)
390 min_ret = iov_iter_count(&msg.msg_iter);
391
392 msg.msg_flags = flags;
393 ret = sock_sendmsg(sock, &msg);
394 if (ret < min_ret) {
395 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
516e82f0
PB		 396 return io_setup_async_addr(req, &__address, issue_flags);
397
f9ead18c
JA		 398 if (ret > 0 && io_net_retry(sock, flags)) {
399 sr->len -= ret;
400 sr->buf += ret;
401 sr->done_io += ret;
402 req->flags |= REQ_F_PARTIAL_IO;
516e82f0 403 return io_setup_async_addr(req, &__address, issue_flags);
f9ead18c 404 }
95eafc74
PB		 405 if (ret == -ERESTARTSYS)
406 ret = -EINTR;
f9ead18c
JA		 407 req_set_fail(req);
408 }
409 if (ret >= 0)
410 ret += sr->done_io;
411 else if (sr->done_io)
412 ret = sr->done_io;
413 io_req_set_res(req, ret, 0);
414 return IOU_OK;
415}
416
9bb66906
DY		 417static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg)
418{
9b0fc3c0 419 int hdr;
9bb66906 420
9b0fc3c0 421 if (iomsg->namelen < 0)
9bb66906 422 return true;
9b0fc3c0
DY		 423 if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out),
424 iomsg->namelen, &hdr))
9bb66906 425 return true;
9b0fc3c0 426 if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr))
9bb66906
DY		 427 return true;
428
429 return false;
430}
431
f9ead18c
JA		 432static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
433 struct io_async_msghdr *iomsg)
434{
f2ccb5ae 435 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
7fa875b8 436 struct user_msghdr msg;
f9ead18c
JA		 437 int ret;
438
7fa875b8
DY		 439 if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg)))
440 return -EFAULT;
441
442 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
f9ead18c
JA		 443 if (ret)
444 return ret;
445
446 if (req->flags & REQ_F_BUFFER_SELECT) {
7fa875b8 447 if (msg.msg_iovlen == 0) {
5702196e
DY		 448 sr->len = iomsg->fast_iov[0].iov_len = 0;
449 iomsg->fast_iov[0].iov_base = NULL;
450 iomsg->free_iov = NULL;
7fa875b8 451 } else if (msg.msg_iovlen > 1) {
f9ead18c 452 return -EINVAL;
5702196e 453 } else {
7fa875b8 454 if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov)))
5702196e
DY		 455 return -EFAULT;
456 sr->len = iomsg->fast_iov[0].iov_len;
457 iomsg->free_iov = NULL;
458 }
9bb66906
DY		 459
460 if (req->flags & REQ_F_APOLL_MULTISHOT) {
461 iomsg->namelen = msg.msg_namelen;
462 iomsg->controllen = msg.msg_controllen;
463 if (io_recvmsg_multishot_overflow(iomsg))
464 return -EOVERFLOW;
465 }
f9ead18c
JA		 466 } else {
467 iomsg->free_iov = iomsg->fast_iov;
de4eda9d 468 ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV,
f9ead18c
JA		 469 &iomsg->free_iov, &iomsg->msg.msg_iter,
470 false);
471 if (ret > 0)
472 ret = 0;
473 }
474
475 return ret;
476}
477
478#ifdef CONFIG_COMPAT
479static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
480 struct io_async_msghdr *iomsg)
481{
f2ccb5ae 482 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
72c531f8 483 struct compat_msghdr msg;
f9ead18c 484 struct compat_iovec __user *uiov;
f9ead18c
JA		 485 int ret;
486
72c531f8
DY		 487 if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg)))
488 return -EFAULT;
489
4f6a94d3 490 ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
f9ead18c
JA		 491 if (ret)
492 return ret;
493
72c531f8 494 uiov = compat_ptr(msg.msg_iov);
f9ead18c
JA		 495 if (req->flags & REQ_F_BUFFER_SELECT) {
496 compat_ssize_t clen;
497
990a4de5 498 iomsg->free_iov = NULL;
72c531f8 499 if (msg.msg_iovlen == 0) {
6d2f75a0 500 sr->len = 0;
72c531f8 501 } else if (msg.msg_iovlen > 1) {
f9ead18c 502 return -EINVAL;
6d2f75a0
DY		 503 } else {
504 if (!access_ok(uiov, sizeof(*uiov)))
505 return -EFAULT;
506 if (__get_user(clen, &uiov->iov_len))
507 return -EFAULT;
508 if (clen < 0)
509 return -EINVAL;
510 sr->len = clen;
6d2f75a0 511 }
9bb66906
DY		 512
513 if (req->flags & REQ_F_APOLL_MULTISHOT) {
514 iomsg->namelen = msg.msg_namelen;
515 iomsg->controllen = msg.msg_controllen;
516 if (io_recvmsg_multishot_overflow(iomsg))
517 return -EOVERFLOW;
518 }
f9ead18c
JA		 519 } else {
520 iomsg->free_iov = iomsg->fast_iov;
de4eda9d 521 ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen,
f9ead18c
JA		 522 UIO_FASTIOV, &iomsg->free_iov,
523 &iomsg->msg.msg_iter, true);
524 if (ret < 0)
525 return ret;
526 }
527
528 return 0;
529}
530#endif
531
532static int io_recvmsg_copy_hdr(struct io_kiocb *req,
533 struct io_async_msghdr *iomsg)
534{
535 iomsg->msg.msg_name = &iomsg->addr;
536
537#ifdef CONFIG_COMPAT
538 if (req->ctx->compat)
539 return __io_compat_recvmsg_copy_hdr(req, iomsg);
540#endif
541
542 return __io_recvmsg_copy_hdr(req, iomsg);
543}
544
545int io_recvmsg_prep_async(struct io_kiocb *req)
546{
547 int ret;
548
858c293e
PB		 549 if (!io_msg_alloc_async_prep(req))
550 return -ENOMEM;
f9ead18c
JA		 551 ret = io_recvmsg_copy_hdr(req, req->async_data);
552 if (!ret)
553 req->flags |= REQ_F_NEED_CLEANUP;
554 return ret;
555}
556
b3fdea6e
DY		 557#define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT)
558
f9ead18c
JA		 559int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
560{
f2ccb5ae 561 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 562
563 if (unlikely(sqe->file_index || sqe->addr2))
564 return -EINVAL;
565
566 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
567 sr->len = READ_ONCE(sqe->len);
568 sr->flags = READ_ONCE(sqe->ioprio);
b3fdea6e 569 if (sr->flags & ~(RECVMSG_FLAGS))
f9ead18c 570 return -EINVAL;
7605c43d 571 sr->msg_flags = READ_ONCE(sqe->msg_flags);
f9ead18c
JA		 572 if (sr->msg_flags & MSG_DONTWAIT)
573 req->flags |= REQ_F_NOWAIT;
574 if (sr->msg_flags & MSG_ERRQUEUE)
575 req->flags |= REQ_F_CLEAR_POLLIN;
b3fdea6e
DY		 576 if (sr->flags & IORING_RECV_MULTISHOT) {
577 if (!(req->flags & REQ_F_BUFFER_SELECT))
578 return -EINVAL;
579 if (sr->msg_flags & MSG_WAITALL)
580 return -EINVAL;
581 if (req->opcode == IORING_OP_RECV && sr->len)
582 return -EINVAL;
583 req->flags |= REQ_F_APOLL_MULTISHOT;
b00c51ef
JA		 584 /*
585 * Store the buffer group for this multishot receive separately,
586 * as if we end up doing an io-wq based issue that selects a
587 * buffer, it has to be committed immediately and that will
588 * clear ->buf_list. This means we lose the link to the buffer
589 * list, and the eventual buffer put on completion then cannot
590 * restore it.
591 */
592 sr->buf_group = req->buf_index;
b3fdea6e 593 }
f9ead18c
JA		 594
595#ifdef CONFIG_COMPAT
596 if (req->ctx->compat)
597 sr->msg_flags |= MSG_CMSG_COMPAT;
598#endif
599 sr->done_io = 0;
600 return 0;
601}
602
b3fdea6e
DY		 603static inline void io_recv_prep_retry(struct io_kiocb *req)
604{
f2ccb5ae 605 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
b3fdea6e
DY		 606
607 sr->done_io = 0;
608 sr->len = 0; /* get from the provided buffer */
b00c51ef 609 req->buf_index = sr->buf_group;
b3fdea6e
DY		 610}
611
612/*
9bb66906 613 * Finishes io_recv and io_recvmsg.
b3fdea6e
DY		 614 *
615 * Returns true if it is actually finished, or false if it should run
616 * again (for multishot).
617 */
9bb66906 618static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
100d6b17
PB		 619 unsigned int cflags, bool mshot_finished,
620 unsigned issue_flags)
b3fdea6e
DY		 621{
622 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
623 io_req_set_res(req, *ret, cflags);
624 *ret = IOU_OK;
625 return true;
626 }
627
9bb66906 628 if (!mshot_finished) {
9b8c5475
DY		 629 if (io_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER,
630 req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) {
b3fdea6e
DY		 631 io_recv_prep_retry(req);
632 return false;
633 }
e2ad599d 634 /* Otherwise stop multishot but use the current result. */
b3fdea6e
DY		 635 }
636
637 io_req_set_res(req, *ret, cflags);
638
100d6b17 639 if (issue_flags & IO_URING_F_MULTISHOT)
b3fdea6e 640 *ret = IOU_STOP_MULTISHOT;
e2df2ccb
DY		 641 else
642 *ret = IOU_OK;
b3fdea6e
DY		 643 return true;
644}
645
9bb66906
DY		 646static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg,
647 struct io_sr_msg *sr, void __user **buf,
648 size_t *len)
649{
650 unsigned long ubuf = (unsigned long) *buf;
651 unsigned long hdr;
652
653 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
654 kmsg->controllen;
655 if (*len < hdr)
656 return -EFAULT;
657
658 if (kmsg->controllen) {
659 unsigned long control = ubuf + hdr - kmsg->controllen;
660
d1f6222c 661 kmsg->msg.msg_control_user = (void __user *) control;
9bb66906
DY		 662 kmsg->msg.msg_controllen = kmsg->controllen;
663 }
664
665 sr->buf = *buf; /* stash for later copy */
d1f6222c 666 *buf = (void __user *) (ubuf + hdr);
9bb66906
DY		 667 kmsg->payloadlen = *len = *len - hdr;
668 return 0;
669}
670
671struct io_recvmsg_multishot_hdr {
672 struct io_uring_recvmsg_out msg;
673 struct sockaddr_storage addr;
674};
675
676static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io,
677 struct io_async_msghdr *kmsg,
678 unsigned int flags, bool *finished)
679{
680 int err;
681 int copy_len;
682 struct io_recvmsg_multishot_hdr hdr;
683
684 if (kmsg->namelen)
685 kmsg->msg.msg_name = &hdr.addr;
686 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
687 kmsg->msg.msg_namelen = 0;
688
689 if (sock->file->f_flags & O_NONBLOCK)
690 flags |= MSG_DONTWAIT;
691
692 err = sock_recvmsg(sock, &kmsg->msg, flags);
693 *finished = err <= 0;
694 if (err < 0)
695 return err;
696
697 hdr.msg = (struct io_uring_recvmsg_out) {
698 .controllen = kmsg->controllen - kmsg->msg.msg_controllen,
699 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT
700 };
701
702 hdr.msg.payloadlen = err;
703 if (err > kmsg->payloadlen)
704 err = kmsg->payloadlen;
705
706 copy_len = sizeof(struct io_uring_recvmsg_out);
707 if (kmsg->msg.msg_namelen > kmsg->namelen)
708 copy_len += kmsg->namelen;
709 else
710 copy_len += kmsg->msg.msg_namelen;
711
712 /*
713 * "fromlen shall refer to the value before truncation.."
714 * 1003.1g
715 */
716 hdr.msg.namelen = kmsg->msg.msg_namelen;
717
718 /* ensure that there is no gap between hdr and sockaddr_storage */
719 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) !=
720 sizeof(struct io_uring_recvmsg_out));
721 if (copy_to_user(io->buf, &hdr, copy_len)) {
722 *finished = true;
723 return -EFAULT;
724 }
725
726 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
727 kmsg->controllen + err;
728}
729
f9ead18c
JA		 730int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
731{
f2ccb5ae 732 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 733 struct io_async_msghdr iomsg, *kmsg;
734 struct socket *sock;
735 unsigned int cflags;
736 unsigned flags;
737 int ret, min_ret = 0;
738 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
9bb66906 739 bool mshot_finished = true;
f9ead18c
JA		 740
741 sock = sock_from_file(req->file);
742 if (unlikely(!sock))
743 return -ENOTSOCK;
744
745 if (req_has_async_data(req)) {
746 kmsg = req->async_data;
747 } else {
748 ret = io_recvmsg_copy_hdr(req, &iomsg);
749 if (ret)
750 return ret;
751 kmsg = &iomsg;
752 }
753
754 if (!(req->flags & REQ_F_POLLED) &&
755 (sr->flags & IORING_RECVSEND_POLL_FIRST))
43e0bbbd 756 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c 757
17add5ce
PB		 758 if (!io_check_multishot(req, issue_flags))
759 return io_setup_async_msg(req, kmsg, issue_flags);
760
9bb66906 761retry_multishot:
f9ead18c
JA		 762 if (io_do_buffer_select(req)) {
763 void __user *buf;
9bb66906 764 size_t len = sr->len;
f9ead18c 765
9bb66906 766 buf = io_buffer_select(req, &len, issue_flags);
f9ead18c
JA		 767 if (!buf)
768 return -ENOBUFS;
9bb66906
DY		 769
770 if (req->flags & REQ_F_APOLL_MULTISHOT) {
771 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len);
772 if (ret) {
773 io_kbuf_recycle(req, issue_flags);
774 return ret;
775 }
776 }
777
4b61152e 778 iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len);
f9ead18c
JA		 779 }
780
781 flags = sr->msg_flags;
782 if (force_nonblock)
783 flags |= MSG_DONTWAIT;
784 if (flags & MSG_WAITALL)
785 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
786
787 kmsg->msg.msg_get_inq = 1;
9bb66906
DY		 788 if (req->flags & REQ_F_APOLL_MULTISHOT)
789 ret = io_recvmsg_multishot(sock, sr, kmsg, flags,
790 &mshot_finished);
791 else
792 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg,
793 kmsg->uaddr, flags);
794
f9ead18c 795 if (ret < min_ret) {
9bb66906
DY		 796 if (ret == -EAGAIN && force_nonblock) {
797 ret = io_setup_async_msg(req, kmsg, issue_flags);
100d6b17 798 if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) {
9bb66906
DY		 799 io_kbuf_recycle(req, issue_flags);
800 return IOU_ISSUE_SKIP_COMPLETE;
801 }
802 return ret;
803 }
f9ead18c
JA		 804 if (ret > 0 && io_net_retry(sock, flags)) {
805 sr->done_io += ret;
806 req->flags |= REQ_F_PARTIAL_IO;
43e0bbbd 807 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c 808 }
95eafc74
PB		 809 if (ret == -ERESTARTSYS)
810 ret = -EINTR;
f9ead18c
JA		 811 req_set_fail(req);
812 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
813 req_set_fail(req);
814 }
815
d4e097da 816 if (ret > 0)
f9ead18c
JA		 817 ret += sr->done_io;
818 else if (sr->done_io)
819 ret = sr->done_io;
d4e097da
DY		 820 else
821 io_kbuf_recycle(req, issue_flags);
822
f9ead18c
JA		 823 cflags = io_put_kbuf(req, issue_flags);
824 if (kmsg->msg.msg_inq)
825 cflags |= IORING_CQE_F_SOCK_NONEMPTY;
b3fdea6e 826
100d6b17 827 if (!io_recv_finish(req, &ret, cflags, mshot_finished, issue_flags))
9bb66906
DY		 828 goto retry_multishot;
829
830 if (mshot_finished) {
9bb66906
DY		 831 /* fast path, check for non-NULL to avoid function call */
832 if (kmsg->free_iov)
833 kfree(kmsg->free_iov);
6c3e8955 834 io_netmsg_recycle(req, issue_flags);
9bb66906
DY		 835 req->flags &= ~REQ_F_NEED_CLEANUP;
836 }
837
838 return ret;
f9ead18c
JA		 839}
840
841int io_recv(struct io_kiocb *req, unsigned int issue_flags)
842{
f2ccb5ae 843 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 844 struct msghdr msg;
845 struct socket *sock;
f9ead18c
JA		 846 unsigned int cflags;
847 unsigned flags;
848 int ret, min_ret = 0;
849 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
b3fdea6e 850 size_t len = sr->len;
f9ead18c
JA		 851
852 if (!(req->flags & REQ_F_POLLED) &&
853 (sr->flags & IORING_RECVSEND_POLL_FIRST))
854 return -EAGAIN;
855
17add5ce
PB		 856 if (!io_check_multishot(req, issue_flags))
857 return -EAGAIN;
858
f9ead18c
JA		 859 sock = sock_from_file(req->file);
860 if (unlikely(!sock))
861 return -ENOTSOCK;
862
b3fdea6e 863retry_multishot:
f9ead18c
JA		 864 if (io_do_buffer_select(req)) {
865 void __user *buf;
866
b3fdea6e 867 buf = io_buffer_select(req, &len, issue_flags);
f9ead18c
JA		 868 if (!buf)
869 return -ENOBUFS;
870 sr->buf = buf;
871 }
872
4b61152e 873 ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter);
f9ead18c
JA		 874 if (unlikely(ret))
875 goto out_free;
876
877 msg.msg_name = NULL;
878 msg.msg_namelen = 0;
879 msg.msg_control = NULL;
880 msg.msg_get_inq = 1;
881 msg.msg_flags = 0;
882 msg.msg_controllen = 0;
883 msg.msg_iocb = NULL;
e02b6651 884 msg.msg_ubuf = NULL;
f9ead18c
JA		 885
886 flags = sr->msg_flags;
887 if (force_nonblock)
888 flags |= MSG_DONTWAIT;
889 if (flags & MSG_WAITALL)
890 min_ret = iov_iter_count(&msg.msg_iter);
891
892 ret = sock_recvmsg(sock, &msg, flags);
893 if (ret < min_ret) {
b3fdea6e 894 if (ret == -EAGAIN && force_nonblock) {
100d6b17 895 if (issue_flags & IO_URING_F_MULTISHOT) {
b3fdea6e
DY		 896 io_kbuf_recycle(req, issue_flags);
897 return IOU_ISSUE_SKIP_COMPLETE;
898 }
899
f9ead18c 900 return -EAGAIN;
b3fdea6e 901 }
f9ead18c
JA		 902 if (ret > 0 && io_net_retry(sock, flags)) {
903 sr->len -= ret;
904 sr->buf += ret;
905 sr->done_io += ret;
906 req->flags |= REQ_F_PARTIAL_IO;
907 return -EAGAIN;
908 }
95eafc74
PB		 909 if (ret == -ERESTARTSYS)
910 ret = -EINTR;
f9ead18c
JA		 911 req_set_fail(req);
912 } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
913out_free:
914 req_set_fail(req);
915 }
916
d4e097da 917 if (ret > 0)
f9ead18c
JA		 918 ret += sr->done_io;
919 else if (sr->done_io)
920 ret = sr->done_io;
d4e097da
DY		 921 else
922 io_kbuf_recycle(req, issue_flags);
923
f9ead18c
JA		 924 cflags = io_put_kbuf(req, issue_flags);
925 if (msg.msg_inq)
926 cflags |= IORING_CQE_F_SOCK_NONEMPTY;
b3fdea6e 927
100d6b17 928 if (!io_recv_finish(req, &ret, cflags, ret <= 0, issue_flags))
b3fdea6e
DY		 929 goto retry_multishot;
930
931 return ret;
f9ead18c
JA		 932}
933
b0e9b551 934void io_send_zc_cleanup(struct io_kiocb *req)
b48c312b 935{
ac9e5784 936 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
493108d9 937 struct io_async_msghdr *io;
b48c312b 938
493108d9
PB		 939 if (req_has_async_data(req)) {
940 io = req->async_data;
4c17a496
PB		 941 /* might be ->fast_iov if *msg_copy_hdr failed */
942 if (io->free_iov != io->fast_iov)
943 kfree(io->free_iov);
493108d9 944 }
a75155fa 945 if (zc->notif) {
a75155fa
PB		 946 io_notif_flush(zc->notif);
947 zc->notif = NULL;
948 }
b48c312b
PB		 949}
950
40725d1b
PB		 951#define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF)
952#define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE)
953
b0e9b551 954int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
06a5464b 955{
ac9e5784 956 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
10c7d33e 957 struct io_ring_ctx *ctx = req->ctx;
b48c312b 958 struct io_kiocb *notif;
06a5464b 959
493108d9 960 if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)))
b48c312b
PB		 961 return -EINVAL;
962 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */
963 if (req->flags & REQ_F_CQE_SKIP)
06a5464b
PB		 964 return -EINVAL;
965
e3366e02
PB		 966 notif = zc->notif = io_alloc_notif(ctx);
967 if (!notif)
968 return -ENOMEM;
969 notif->cqe.user_data = req->cqe.user_data;
970 notif->cqe.res = 0;
971 notif->cqe.flags = IORING_CQE_F_NOTIF;
972 req->flags |= REQ_F_NEED_CLEANUP;
40725d1b
PB		 973
974 zc->flags = READ_ONCE(sqe->ioprio);
975 if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) {
976 if (zc->flags & ~IO_ZC_FLAGS_VALID)
977 return -EINVAL;
978 if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) {
979 io_notif_set_extended(notif);
980 io_notif_to_data(notif)->zc_report = true;
981 }
982 }
983
10c7d33e
PB		 984 if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
985 unsigned idx = READ_ONCE(sqe->buf_index);
986
987 if (unlikely(idx >= ctx->nr_user_bufs))
988 return -EFAULT;
989 idx = array_index_nospec(idx, ctx->nr_user_bufs);
990 req->imu = READ_ONCE(ctx->user_bufs[idx]);
e3366e02 991 io_req_set_rsrc_node(notif, ctx, 0);
10c7d33e 992 }
06a5464b 993
493108d9
PB		 994 if (req->opcode == IORING_OP_SEND_ZC) {
995 if (READ_ONCE(sqe->__pad3[0]))
996 return -EINVAL;
997 zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
998 zc->addr_len = READ_ONCE(sqe->addr_len);
999 } else {
1000 if (unlikely(sqe->addr2 || sqe->file_index))
1001 return -EINVAL;
1002 if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF))
1003 return -EINVAL;
1004 }
1005
06a5464b
PB		 1006 zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr));
1007 zc->len = READ_ONCE(sqe->len);
1008 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
06a5464b
PB		 1009 if (zc->msg_flags & MSG_DONTWAIT)
1010 req->flags |= REQ_F_NOWAIT;
092aeedb 1011
4a933e62 1012 zc->done_io = 0;
092aeedb 1013
06a5464b
PB		 1014#ifdef CONFIG_COMPAT
1015 if (req->ctx->compat)
1016 zc->msg_flags |= MSG_CMSG_COMPAT;
1017#endif
1018 return 0;
1019}
1020
cd9021e8
PB		 1021static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb,
1022 struct iov_iter *from, size_t length)
1023{
1024 skb_zcopy_downgrade_managed(skb);
1025 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length);
1026}
1027
3ff1a0d3
PB		 1028static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb,
1029 struct iov_iter *from, size_t length)
1030{
1031 struct skb_shared_info *shinfo = skb_shinfo(skb);
1032 int frag = shinfo->nr_frags;
1033 int ret = 0;
1034 struct bvec_iter bi;
1035 ssize_t copied = 0;
1036 unsigned long truesize = 0;
1037
cd9021e8 1038 if (!frag)
3ff1a0d3 1039 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS;
cd9021e8 1040 else if (unlikely(!skb_zcopy_managed(skb)))
3ff1a0d3 1041 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length);
3ff1a0d3
PB		 1042
1043 bi.bi_size = min(from->count, length);
1044 bi.bi_bvec_done = from->iov_offset;
1045 bi.bi_idx = 0;
1046
1047 while (bi.bi_size && frag < MAX_SKB_FRAGS) {
1048 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi);
1049
1050 copied += v.bv_len;
1051 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset);
1052 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page,
1053 v.bv_offset, v.bv_len);
1054 bvec_iter_advance_single(from->bvec, &bi, v.bv_len);
1055 }
1056 if (bi.bi_size)
1057 ret = -EMSGSIZE;
1058
1059 shinfo->nr_frags = frag;
1060 from->bvec += bi.bi_idx;
1061 from->nr_segs -= bi.bi_idx;
dfb58b17 1062 from->count -= copied;
3ff1a0d3
PB		 1063 from->iov_offset = bi.bi_bvec_done;
1064
1065 skb->data_len += copied;
1066 skb->len += copied;
1067 skb->truesize += truesize;
1068
1069 if (sk && sk->sk_type == SOCK_STREAM) {
1070 sk_wmem_queued_add(sk, truesize);
1071 if (!skb_zcopy_pure(skb))
1072 sk_mem_charge(sk, truesize);
1073 } else {
1074 refcount_add(truesize, &skb->sk->sk_wmem_alloc);
1075 }
1076 return ret;
1077}
1078
b0e9b551 1079int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
06a5464b 1080{
6ae61b7a 1081 struct sockaddr_storage __address;
ac9e5784 1082 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
06a5464b 1083 struct msghdr msg;
06a5464b 1084 struct socket *sock;
6ae91ac9 1085 unsigned msg_flags;
06a5464b
PB		 1086 int ret, min_ret = 0;
1087
06a5464b
PB		 1088 sock = sock_from_file(req->file);
1089 if (unlikely(!sock))
1090 return -ENOTSOCK;
edf81438
PB		 1091 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
1092 return -EOPNOTSUPP;
06a5464b 1093
06a5464b
PB		 1094 msg.msg_name = NULL;
1095 msg.msg_control = NULL;
1096 msg.msg_controllen = 0;
1097 msg.msg_namelen = 0;
1098
86dc8f23 1099 if (zc->addr) {
581711c4
PB		 1100 if (req_has_async_data(req)) {
1101 struct io_async_msghdr *io = req->async_data;
1102
6ae61b7a 1103 msg.msg_name = &io->addr;
581711c4
PB		 1104 } else {
1105 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address);
1106 if (unlikely(ret < 0))
1107 return ret;
1108 msg.msg_name = (struct sockaddr *)&__address;
581711c4 1109 }
86dc8f23
PB		 1110 msg.msg_namelen = zc->addr_len;
1111 }
1112
3c840053
PB		 1113 if (!(req->flags & REQ_F_POLLED) &&
1114 (zc->flags & IORING_RECVSEND_POLL_FIRST))
6ae61b7a 1115 return io_setup_async_addr(req, &__address, issue_flags);
3c840053 1116
10c7d33e 1117 if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
de4eda9d 1118 ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu,
10c7d33e
PB		 1119 (u64)(uintptr_t)zc->buf, zc->len);
1120 if (unlikely(ret))
986e263d 1121 return ret;
cd9021e8 1122 msg.sg_from_iter = io_sg_from_iter;
10c7d33e 1123 } else {
42385b02 1124 io_notif_set_extended(zc->notif);
4b61152e 1125 ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &msg.msg_iter);
10c7d33e
PB		 1126 if (unlikely(ret))
1127 return ret;
b48c312b 1128 ret = io_notif_account_mem(zc->notif, zc->len);
2e32ba56
PB		 1129 if (unlikely(ret))
1130 return ret;
cd9021e8 1131 msg.sg_from_iter = io_sg_from_iter_iovec;
10c7d33e 1132 }
06a5464b
PB		 1133
1134 msg_flags = zc->msg_flags | MSG_ZEROCOPY;
1135 if (issue_flags & IO_URING_F_NONBLOCK)
1136 msg_flags |= MSG_DONTWAIT;
1137 if (msg_flags & MSG_WAITALL)
1138 min_ret = iov_iter_count(&msg.msg_iter);
1139
1140 msg.msg_flags = msg_flags;
b48c312b 1141 msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg;
06a5464b
PB		 1142 ret = sock_sendmsg(sock, &msg);
1143
1144 if (unlikely(ret < min_ret)) {
1145 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
6ae61b7a 1146 return io_setup_async_addr(req, &__address, issue_flags);
581711c4 1147
4a933e62
PB		 1148 if (ret > 0 && io_net_retry(sock, msg.msg_flags)) {
1149 zc->len -= ret;
1150 zc->buf += ret;
1151 zc->done_io += ret;
1152 req->flags |= REQ_F_PARTIAL_IO;
6ae61b7a 1153 return io_setup_async_addr(req, &__address, issue_flags);
4a933e62
PB		 1154 }
1155 if (ret == -ERESTARTSYS)
1156 ret = -EINTR;
5a848b7c 1157 req_set_fail(req);
06a5464b
PB		 1158 }
1159
4a933e62
PB		 1160 if (ret >= 0)
1161 ret += zc->done_io;
1162 else if (zc->done_io)
1163 ret = zc->done_io;
b48c312b 1164
108893dd
PB		 1165 /*
1166 * If we're in io-wq we can't rely on tw ordering guarantees, defer
1167 * flushing notif to io_send_zc_cleanup()
1168 */
1169 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
1170 io_notif_flush(zc->notif);
1171 req->flags &= ~REQ_F_NEED_CLEANUP;
1172 }
6ae91ac9 1173 io_req_set_res(req, ret, IORING_CQE_F_MORE);
06a5464b
PB		 1174 return IOU_OK;
1175}
1176
493108d9
PB		 1177int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
1178{
1179 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
1180 struct io_async_msghdr iomsg, *kmsg;
1181 struct socket *sock;
6ae91ac9 1182 unsigned flags;
493108d9
PB		 1183 int ret, min_ret = 0;
1184
42385b02
PB		 1185 io_notif_set_extended(sr->notif);
1186
493108d9
PB		 1187 sock = sock_from_file(req->file);
1188 if (unlikely(!sock))
1189 return -ENOTSOCK;
cc767e7c
PB		 1190 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
1191 return -EOPNOTSUPP;
493108d9
PB		 1192
1193 if (req_has_async_data(req)) {
1194 kmsg = req->async_data;
1195 } else {
1196 ret = io_sendmsg_copy_hdr(req, &iomsg);
1197 if (ret)
1198 return ret;
1199 kmsg = &iomsg;
1200 }
1201
1202 if (!(req->flags & REQ_F_POLLED) &&
1203 (sr->flags & IORING_RECVSEND_POLL_FIRST))
1204 return io_setup_async_msg(req, kmsg, issue_flags);
1205
1206 flags = sr->msg_flags | MSG_ZEROCOPY;
1207 if (issue_flags & IO_URING_F_NONBLOCK)
1208 flags |= MSG_DONTWAIT;
1209 if (flags & MSG_WAITALL)
1210 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
1211
1212 kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg;
1213 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
1214 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
1215
1216 if (unlikely(ret < min_ret)) {
1217 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1218 return io_setup_async_msg(req, kmsg, issue_flags);
1219
1220 if (ret > 0 && io_net_retry(sock, flags)) {
1221 sr->done_io += ret;
1222 req->flags |= REQ_F_PARTIAL_IO;
1223 return io_setup_async_msg(req, kmsg, issue_flags);
1224 }
493108d9
PB		 1225 if (ret == -ERESTARTSYS)
1226 ret = -EINTR;
1227 req_set_fail(req);
1228 }
1229 /* fast path, check for non-NULL to avoid function call */
108893dd 1230 if (kmsg->free_iov) {
493108d9 1231 kfree(kmsg->free_iov);
108893dd
PB		 1232 kmsg->free_iov = NULL;
1233 }
493108d9
PB		 1234
1235 io_netmsg_recycle(req, issue_flags);
1236 if (ret >= 0)
1237 ret += sr->done_io;
1238 else if (sr->done_io)
1239 ret = sr->done_io;
1240
108893dd
PB		 1241 /*
1242 * If we're in io-wq we can't rely on tw ordering guarantees, defer
1243 * flushing notif to io_send_zc_cleanup()
1244 */
1245 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
1246 io_notif_flush(sr->notif);
1247 req->flags &= ~REQ_F_NEED_CLEANUP;
1248 }
6ae91ac9 1249 io_req_set_res(req, ret, IORING_CQE_F_MORE);
493108d9
PB		 1250 return IOU_OK;
1251}
1252
7e6b638e
PB		 1253void io_sendrecv_fail(struct io_kiocb *req)
1254{
1255 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
7e6b638e
PB		 1256
1257 if (req->flags & REQ_F_PARTIAL_IO)
6ae91ac9
PB		 1258 req->cqe.res = sr->done_io;
1259
c4c0009e 1260 if ((req->flags & REQ_F_NEED_CLEANUP) &&
6ae91ac9
PB		 1261 (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC))
1262 req->cqe.flags |= IORING_CQE_F_MORE;
5693bcce
PB		 1263}
1264
f9ead18c
JA		 1265int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1266{
f2ccb5ae 1267 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
f9ead18c
JA		 1268 unsigned flags;
1269
1270 if (sqe->len || sqe->buf_index)
1271 return -EINVAL;
1272
1273 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1274 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
1275 accept->flags = READ_ONCE(sqe->accept_flags);
1276 accept->nofile = rlimit(RLIMIT_NOFILE);
1277 flags = READ_ONCE(sqe->ioprio);
1278 if (flags & ~IORING_ACCEPT_MULTISHOT)
1279 return -EINVAL;
1280
1281 accept->file_slot = READ_ONCE(sqe->file_index);
1282 if (accept->file_slot) {
1283 if (accept->flags & SOCK_CLOEXEC)
1284 return -EINVAL;
1285 if (flags & IORING_ACCEPT_MULTISHOT &&
1286 accept->file_slot != IORING_FILE_INDEX_ALLOC)
1287 return -EINVAL;
1288 }
1289 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1290 return -EINVAL;
1291 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
1292 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1293 if (flags & IORING_ACCEPT_MULTISHOT)
1294 req->flags |= REQ_F_APOLL_MULTISHOT;
1295 return 0;
1296}
1297
1298int io_accept(struct io_kiocb *req, unsigned int issue_flags)
1299{
1300 struct io_ring_ctx *ctx = req->ctx;
f2ccb5ae 1301 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
f9ead18c
JA		 1302 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1303 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0;
1304 bool fixed = !!accept->file_slot;
1305 struct file *file;
1306 int ret, fd;
1307
17add5ce
PB		 1308 if (!io_check_multishot(req, issue_flags))
1309 return -EAGAIN;
f9ead18c
JA		 1310retry:
1311 if (!fixed) {
1312 fd = __get_unused_fd_flags(accept->flags, accept->nofile);
1313 if (unlikely(fd < 0))
1314 return fd;
1315 }
1316 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len,
1317 accept->flags);
1318 if (IS_ERR(file)) {
1319 if (!fixed)
1320 put_unused_fd(fd);
1321 ret = PTR_ERR(file);
1322 if (ret == -EAGAIN && force_nonblock) {
1323 /*
1324 * if it's multishot and polled, we don't need to
1325 * return EAGAIN to arm the poll infra since it
1326 * has already been done
1327 */
91482864 1328 if (issue_flags & IO_URING_F_MULTISHOT)
f9ead18c
JA		 1329 ret = IOU_ISSUE_SKIP_COMPLETE;
1330 return ret;
1331 }
1332 if (ret == -ERESTARTSYS)
1333 ret = -EINTR;
1334 req_set_fail(req);
1335 } else if (!fixed) {
1336 fd_install(fd, file);
1337 ret = fd;
1338 } else {
1339 ret = io_fixed_fd_install(req, issue_flags, file,
1340 accept->file_slot);
1341 }
1342
1343 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
1344 io_req_set_res(req, ret, 0);
1345 return IOU_OK;
1346 }
f9ead18c 1347
515e2696
DY		 1348 if (ret < 0)
1349 return ret;
9b8c5475
DY		 1350 if (io_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER,
1351 req->cqe.user_data, ret, IORING_CQE_F_MORE, true))
d245bca6 1352 goto retry;
cbd25748 1353
515e2696 1354 return -ECANCELED;
f9ead18c
JA		 1355}
1356
1357int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1358{
f2ccb5ae 1359 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
f9ead18c
JA		 1360
1361 if (sqe->addr || sqe->rw_flags || sqe->buf_index)
1362 return -EINVAL;
1363
1364 sock->domain = READ_ONCE(sqe->fd);
1365 sock->type = READ_ONCE(sqe->off);
1366 sock->protocol = READ_ONCE(sqe->len);
1367 sock->file_slot = READ_ONCE(sqe->file_index);
1368 sock->nofile = rlimit(RLIMIT_NOFILE);
1369
1370 sock->flags = sock->type & ~SOCK_TYPE_MASK;
1371 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC))
1372 return -EINVAL;
1373 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1374 return -EINVAL;
1375 return 0;
1376}
1377
1378int io_socket(struct io_kiocb *req, unsigned int issue_flags)
1379{
f2ccb5ae 1380 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
f9ead18c
JA		 1381 bool fixed = !!sock->file_slot;
1382 struct file *file;
1383 int ret, fd;
1384
1385 if (!fixed) {
1386 fd = __get_unused_fd_flags(sock->flags, sock->nofile);
1387 if (unlikely(fd < 0))
1388 return fd;
1389 }
1390 file = __sys_socket_file(sock->domain, sock->type, sock->protocol);
1391 if (IS_ERR(file)) {
1392 if (!fixed)
1393 put_unused_fd(fd);
1394 ret = PTR_ERR(file);
1395 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1396 return -EAGAIN;
1397 if (ret == -ERESTARTSYS)
1398 ret = -EINTR;
1399 req_set_fail(req);
1400 } else if (!fixed) {
1401 fd_install(fd, file);
1402 ret = fd;
1403 } else {
1404 ret = io_fixed_fd_install(req, issue_flags, file,
1405 sock->file_slot);
1406 }
1407 io_req_set_res(req, ret, 0);
1408 return IOU_OK;
1409}
1410
1411int io_connect_prep_async(struct io_kiocb *req)
1412{
1413 struct io_async_connect *io = req->async_data;
f2ccb5ae 1414 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
f9ead18c
JA		 1415
1416 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address);
1417}
1418
1419int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1420{
f2ccb5ae 1421 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
f9ead18c
JA		 1422
1423 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
1424 return -EINVAL;
1425
1426 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1427 conn->addr_len = READ_ONCE(sqe->addr2);
74e2e17e 1428 conn->in_progress = conn->seen_econnaborted = false;
f9ead18c
JA		 1429 return 0;
1430}
1431
1432int io_connect(struct io_kiocb *req, unsigned int issue_flags)
1433{
f2ccb5ae 1434 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
f9ead18c
JA		 1435 struct io_async_connect __io, *io;
1436 unsigned file_flags;
1437 int ret;
1438 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1439
3fb1bd68
JA		 1440 if (connect->in_progress) {
1441 struct socket *socket;
1442
1443 ret = -ENOTSOCK;
1444 socket = sock_from_file(req->file);
1445 if (socket)
1446 ret = sock_error(socket->sk);
1447 goto out;
1448 }
1449
f9ead18c
JA		 1450 if (req_has_async_data(req)) {
1451 io = req->async_data;
1452 } else {
1453 ret = move_addr_to_kernel(connect->addr,
1454 connect->addr_len,
1455 &__io.address);
1456 if (ret)
1457 goto out;
1458 io = &__io;
1459 }
1460
1461 file_flags = force_nonblock ? O_NONBLOCK : 0;
1462
1463 ret = __sys_connect_file(req->file, &io->address,
1464 connect->addr_len, file_flags);
74e2e17e
JA		 1465 if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED)
1466 && force_nonblock) {
3fb1bd68
JA		 1467 if (ret == -EINPROGRESS) {
1468 connect->in_progress = true;
74e2e17e
JA		 1469 return -EAGAIN;
1470 }
1471 if (ret == -ECONNABORTED) {
1472 if (connect->seen_econnaborted)
3fb1bd68 1473 goto out;
74e2e17e
JA		 1474 connect->seen_econnaborted = true;
1475 }
1476 if (req_has_async_data(req))
1477 return -EAGAIN;
1478 if (io_alloc_async_data(req)) {
1479 ret = -ENOMEM;
1480 goto out;
f9ead18c 1481 }
74e2e17e 1482 memcpy(req->async_data, &__io, sizeof(__io));
f9ead18c
JA		 1483 return -EAGAIN;
1484 }
1485 if (ret == -ERESTARTSYS)
1486 ret = -EINTR;
1487out:
1488 if (ret < 0)
1489 req_set_fail(req);
1490 io_req_set_res(req, ret, 0);
1491 return IOU_OK;
1492}
43e0bbbd
JA		 1493
1494void io_netmsg_cache_free(struct io_cache_entry *entry)
1495{
1496 kfree(container_of(entry, struct io_async_msghdr, cache));
1497}
f9ead18c 1498#endif
Linux 6.x block layer and io_uring tree(s)